Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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Flow directing insert -For a reactor chamber and a reactor.
The present invention relates to a flow directing insert in a reactor
chamber in a reactor, which reactor chamber has a mainly square-
s shaped cross-section and has an inlet at one corner of the chamber and
an outlet at a another corner of the chamber. At least one of the walls of
the reactor chamber consists of a solid heat conductive material or a
membrane.
Conventional reactors for carrying through dififerent kinds of chemical
reactions in a batch-wise manner have usually been in the shape of a
vessel of a suitable dimension into which the reactants are poured and
allowed to react during a predetermined reaction time. The vessel is
usually provided with mixing means. If it is necessary to heat or cool the
reactants the vessel may have been provided with a heating or cooling
mantle or heating or cooling coils, which are immersed in the reactants.
The heat transfer characteristics of such an arrangement is poor as well
as the mixing.
Another type of reactor making it possible to carry through reactions
continuously consists of tube reactors comprising tubes of suitable length,
through which the reactants are made to flow. Such an arrangement
gives possibility to control the holding time especially at turbulent
conditions. If the reactants should be heated or cooled, the tube may be
surrounded by a shell, through which heating or cooling medium is forced
to flow.
In the latest time plate reactors often called micro-reactors for carrying
through catalytic reactions have been presented to the market. These
micro reactors are often used in connection with fuel cel4s. Such a micro-
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reactor is described for example in EP 1 091 800, which shows a
compact, catalytic reactor built up of piled textured plates forming reaction
spaces and heat-bearing spaces. The texture may be in the form of
channels aiming at a good distribution of the reaction liquid.
This type of reactors may also be used on a larger scale.
Flow directing inserts are known in many connections in order to divide a
flow and to ensure that the flow direction constantly is changed. These
inserts consist of different kinds of packing material, which is available in
different materials and configurations. WO 01 /94006 describes an
example of a tube reactor of this kind with reaction tubes with modular
packing that create turbulence in order to promote fluid flow through the
packing material.
The present invention aims at providing a reactor chamber with a flow
directing insert which makes it possible to get a precise hydrodynamic
control of the flow conditions for the reactants which are to pass the
reactor chamber. This goal is obtained in that the insert comprises a
number of units arranged in rows, which units together with the walls of
the chamber define a channel for a fluid, which channel extends from a
first side of the chamber to a second side of the chamber and back again
to the first side backwards and forwards a number of times and that the
units are arranged such that the fluid is forced to flow between the units in
a serpentine path. The insert according to the invention, which forces the
fluid to change flow direction frequently, brings about turbulent flow
conditions that efficiently prevent the occurrence of layers of fluid flowing
at different flow rates and no stagnant zones are found. High mixing rates
are obtained and a narrow distribution of the residence tine is obtained.
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The fluid reactants passing the channel may be pure liquids, mixtures of
liquids, liquids with particles or liquids with dissolved or free gas.
The insert may have a square-shaped form and a square-shaped cross-
section. The length of each row in the insert may be considerably larger
than the distance between two opposite walls in the reactor chamber.
The mentioned opposite walls may one or both consist of a heat
conductive material, which make it possible to let a cooling or heating
fluid pass outside the channel. One of the walls or both may alternatively
consist of a membrane of a suitable pore size making it possible to let a
formed product or products pass the membrane. Combinations of walls of
these kinds may also be possible
The square-shaped insert may if so is desired be rolled to a tube or in a
spiral. In such a case the walls of the reactor chamber must of course be
given the same shape.
The units in the flow directing insert of the invention is with advantage
designed such that each unit has one plane surface intended to abut one
wall of the reactor chamber or the plane side of another unit in a
tightening manner. The unit has an extension that is less than the
distance between two opposite walls in the reactor chamber.
The flow directing insert is advantageously built up in such a way that
each row of units is separated from an adjacent row of units by delimiting
means, which abuts the walls of the reactor chair~ber in a tightening way.
The reaction chamber may be arranged such that the fluid flows through
the reaction chamber by the action of gravity, that is the inlet to the
chamber may be situated above the outlet. It is of course also possible to
make the fluid pass through the chamber driven by pump drive, which
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means that the in- and outlet to the chamber are situated on the same
level.
The units in the flow directing insert have with advantage a side opposite
to the plane surface with a softly bended shape, for example a cylindrical
shape. In this manner there is obtained very favourable flow conditions.
In a flow directing insert according to the invention there is
advantageously a connection between two adjacent rows of units in the
reactor chamber, which is obtained in that there is an opening between
one end of a row and a reactor wall and also between the next row of
units and the same reactor wall. In this way the fluid may flow from one
row to the other in the created empty space.
The flow directing insert may contain at least two units in at least two
rows one adjacent the other which are arranged such that an opening in a
cylindrical part of one unit co-operating with an opening in the delimiting
means together with an opening in the cylindrical part of a second unit
form a passage extending through a part of the insert or through the
whole insert. Such passages give a possibility to create a connection
between an inlet at one end of the reactor chamber and the flow of fluid
anywhere in the reactor chamber. The passages may be used for
injecting a liquid or gas reactant into the flow of fluid. They may also be
used for taking samples or measuring for example temperature or
pressure. If so is desired a cooling or heating medium may be conducted
through the formed passages.
The flow directing insert containing a desired number of rows and
delimiting means is with advantage manufactured in one piece.
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Depending on the desired material in the insert it may for example be
manufactured by moulding, pressing, milling or by casting.
The flow directing insert containing a number of units and limits may
5 alternatively be produced in pieces of column shape, which together form
the insert. This may be necessary if the units have a softly bended form
also close to the plane surface.
One especially suitable material for manufacturing the insert consists of
polyetheretherketone, PEEK. Other materials may be carbon, glass or
metal.
The flow controlling insert according to the invention will be further
described with reference to the attached drawings which show two
- 15 examples of embodiments of the flow directing insert. These
embodiments have been chosen as examples only.
Fig. 1-3 show different views of a single unit with limits intended to be a
part of an insert.
Fig. 4 shows a perspective drawing of a number of units compiled to a
part of an insert.
Fig. 5 shows a perspective drawing of two units provided with openings
intended to be arranged' in two adjacent rows.
Fig. 6 shows a cross-section of a row of units provided with openings in
the cylindrical part of the unit.
Fig. 7 shows a perspective drawing of three rows of units with openings.
Fig. 8 shows a perspective drawing of a section of an insert located in a
reactor chamber.
Fig. 9-11 show different views of another embodiment of a single unit
intended to be a part of an insert.
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Fig. 12 shows a perspective drawing of how these units are combined to
be a part of an insert.
Fig. 13 shows a perspective drawing of how these units may be
manufactured in the form of columns.
Fig. 14 shows a cross-section or a row of units.
Fig. 15 shows how ten units in three rows form a part of an insert.
Fig. 16 shows an insert located in a reaction chamber in a plate seen
both from the front and from the back.
Fig. 17 shows a perspective view of a part of an example of a reactor with
a reactor chamber containing inserts according to the invention.
In fig. 1 there is shown a single unit 1 seen from one side, which unit 1
together with similar units arranged in rows form an insert for a reactor
chamber. The unit 1 has a plane surface 2 and upper and lower square-
shaped limits 3, 4.
The unit 1 has a cylindrical part 5 on its side opposite to the plane surface
as may be seen in fig. 2, which shows a cross-section of the unit.
In fig. 3 the unit 1 is seen from the side. As may be seen in fig. 2 and 3
there is formed a free space 6 within the unit limited by the extension of
the limits 3 and 4. This free space is intended for the fluid, which shall
pass the reactor chamber.
In fig. 4 there is shown how nine units 1 are arranged in relation to each
other in order to form the insert for the reactor chamber. As may be seen
in fig. 4 the nine units shown in the figure are arranged such that the
plane surface of the first and third units in every row are turned at the
same side, whereas the second unit in each row is turned 180 ° in
relation to the first and third unit. In this way the plane surfaces of the
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units define an area (surface), which together with the walls of the reactor
chamber (not shown here) form a meander shaped channel for the fluid.
The fluid flows through the free spaces 6 between the units and between
the cylindrical part 5 of the units and the walls of the reaction chamber. In
order to bring the fluid to flow in the formed channel it is of course
necessary that the plane surface of the units abuts the adjacent wall such
that no fluid may by-pass the channel. The upper 3 and lower 4 limits of
the units 1 define alone and together delimiting means between the rows.
In these drawings the rows of the insert are built up of single units. If so
is
desired it is of course possible to build up an insert containing units,
where two units turn their plane surfaces against each other. This gives
an efficient distribution of the flow at the cost of the possibility to
accurately control the residence time distribution in the chamber.
In fig. 5 there is shown two units intended to be arranged in rows adjacent
to each other. Both these units have an opening 7 in the cylindrical part of
the unit that extends through the unit from the upper 3 to the lower 4 limit.
With such an arrangement it is possible to connect an inlet at one end of
the reactor chamber such that a flow of injected fluid is added to a flow of
the first fluid at any desired point in the reactor chamber. The connection
is established in that a unit with an opening 7 also has an opening
anywhere in the surface of the cylindrical part of the unit, which two
openings are connected somewhere in the unit. It is also possible to have
a number of units with openings in a number of adjacent rows such that
there is formed a passage, which extends all the way.through the insert.
In fig. 6 there is shown a cross-section of a number of units 1 provided
with openings 7. The individual limits 4 of the units form together the
delimiting means 8. At the right end of the figure there is a cavity 9 in the
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delimiting means 8. This cavity 9 makes it possible for the fluid to flow
from one row of units to an adjacent row of units.
Fig 7. shows three rows of units provided with openings 7. As may be
seen in the drawing the uppermost delimiting means 8 extends somewhat
longer to the right than the next delimiting means. This space
corresponds to the cavity 9 shown in figure 6. A fluid, which is to flow
through the reactor chamber (no walls are shown in this figure), enters
the reaction chamber through an inlet (not shown) situated in close
vicinity to the left end of the uppermost row of units. The fluid then flows
in a serpentine path in the free space 6 between the units, until it reaches
the right end of the uppermost row. Due to the cavity 9 the fluid may then
pass to the next row and flow through the free space between the units
from right to left. As may be seen in the figure there is a corresponding
cavity in the third delimiting means 8, giving the fluid the possibility to
enter the third row of units. In this drawing the insert is shown standing.
Of course it is just as possible that the insert is arranged in a reactor
chamber, which is horizontal.
In fig. 8 it is shown how an insert comprising a block of units 1 moulded in
one piece may be arranged in a reactor chamber. The reactor chamber
surrounds a space in the shape of an elongated square. In the drawing,
which only shows a small section of the reactor chamber, there is shown
the farther wall 10 of the chamber and the side walls 11, 12. The front
wall of the reactor chamber has been omitted for sake of clarity. In the
drawing it is seen how the fluid arrives from the right end of the chamber
and flows in a serpentine path in the channel, which is defined by the
units and the walls of the chamber. The cavity 9 formed between the
insert and the side wall 12 makes it possible for the fluid to pass on to the
adjacent lower row.
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In fig. 9 there is shown an embodiment of a unit with slightly different form
giving another kind of insert. The unit 1 ~ is seen from one side and has
also upper and lower limits 3~ and 4~. In fig. 10 there is shown a cross-
section of the unit 1 ~. As may be seen in the drawing the unit 1 ~ has a
plane surface 2~ and a cylindrical part 5~. There is a softly bended
change-over from the cylindrical part to the plane part. The upper and
lower limits 3~ and 4~ have the shape of a truncated triangle with two
parallel sides. As, may be seen in fig.11 there is a space 6~ in front of the
cylindrical part 5~ of the unit.
In fig. 12 there is seen how the units may be arranged in order to form a
part of the insert intended to be used in fihe reactor chamber, every
second unit being turned 180 ° in relation to the other unit. The part
of
the insert shown in fig. 12 may, as is shown in fig.13, be built up of
columns 13, which are manufactured in one piece comprising a desired
number of units.
In fig. 14 there is shown a cross-section of a number of units 1 ~ in a row.
The plane surfaces 2~ of the units are intended to abut on the walls of the
reactor chamber in a tightening manner. In the drawing it is seen how the
softly bended parts of the units 1' close to the plane surface 2~ together
with the cylindrical part of the units form a serpentine channel.
In fig. 15 there is shown a perspective view of three rows of units with ten
units in each. In this figure there is seen how the upper and lower limits of
the units co-operate to form plane upper and lower surfaces which form
the delimiting means separating the rows. It is also seen how the plane
surfaces 2~ form a plane area with small openings 14. The walls of the
reaction chamber should abut on this plane area (surface) in a tightening
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manner and form a limitation for the channel, which is obtained between
the units.
In fig. 16 the insert 15 is shown within a reactor chamber 16. The reactor
5 chamber is situated in a square-shaped opening in a rectangular plate 17.
The reactor chamber is limited by the edges of the square-shaped
opening and of thin plates or membranes situated behind and in front of
the plate 17. (The thin plates or membranes are not shown in fig. 16.) At
one end of the chamber there is an inlet 18 for the fluid, which shall pass
10 the reactor chamber and at another end of the reactor chamber there is
an outlet 19 for the fluid.
A part of a reactor containing three reactor chambers 16 is shown in
fig. 17. The walls 20, 21 surrounding the reactor chambers consist in this
embodiment of thin plates of a heat conductive material. Membranes
may, if so is suitable, be used instead of thin plates on one or both sides
of the reactor chamber. At both sides of the reactor chamber there are
channels 22 through which a cooling or heating fluid may flow. The
channels 22 are on their other side delimited by walls 23. Between the
channels for cooling or heating fluid are transition plates 24. The reaction
chambers 16, the channels for cooling or heating medium and the
transitions plates are surrounded on both sides by frame plates 25 and
the package is held together by bolts 26. There is an inlet pipe 27 at one
end of the reactor and a corresponding hole in the frame plates 25 and
the walls surrounding the channels for cooling or heating medium. The
fluid, which shall pass the reactor chamber, enters through the inlet pipe
27 and the mentioned holes and arrives to the inlet 18 of the reactor
chamber 16.
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The fluid then flows in a serpentine path between the units in the first
uppermost row, then through the next row and further on until all the rows
in the first reaction chamber have been passed. The fluid then passes
holes in the lower end of the reactor (not shown) and enters the second
reactor chamber. In this the fluid is forced to flow from one side of the
reactor chamber to the other side between the units in row after row
upwards until it reaches the row on the top. There is outlet 19 from the
reactor chamber through which the fluid may pass on through the holes in
the walls 21, 23 and through an opening 28 in the transition plate 24.
In this embodiment the reactor chambers are connected in series.
Of course it is also possible to connect the reactor chambers in parallel if
so is desired.
Instead of having heating or cooling channels on both sides of a reactor
chamber it is also possible to separate two reactor chambers from each
other by a membrane. With such an arrangement with a heating or
cooling channel, a reactor chamber, a membrane, a reactor chamber and
a heating or cooling channel arranged beside each other a first reaction
may take place in the first reaction chamber and one component,
originally present or formed during the reaction, may pass the membrane
for a further reaction or heating or cooling.
In the embodiments shown in the drawings all the units in an insert are of
the same size and shape. Of course it is possible within the scope of the
invention to use units of a smaller or thicker extension in one or a number
of rows, or in only a part of a row. The upper or lower limits may be made
thicker, which of course alters the size of the channel. Such a reduction of
the size of the channel may bring about an increase in the flow rate,
which may be of advantage.
